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Macadamia nuts are high in healthy fats and may help those trying to lose weight. One serving of macadamia nuts also contains dietary fiber, protein, manganese, thiamin, and a good amount of copper.

The fat content of macadamia nuts is higher than that of other popular nuts such as almonds, cashews, and walnuts. A 1-ounce (oz) serving of macadamia nuts has 21 grams (g) of total fat.

More than 75 percent of the fat that macadamia nuts contains is monounsaturated fat, which has health benefits. These nuts also contain specific kinds of monounsaturated fatty acids (MUFAs), which are not readily available in many other foods.

Macadamia nuts contain just over 1 g of natural sugar, and they are a low glycemic index food. With their many health benefits, macadamia nuts can fit into any healthful diet.

HbA1c is an important measurement for people with diabetes. It is a person's average blood sugar level over the past 2–3 months. A study on rats with diabetes found that a diet high in MUFAs plus exercise was more effective at lowering HbA1c than either eating the fats or exercising alone.

Another study shows that tree nuts such as macadamia nuts help improve glycemic control in people with type 2 diabetes.

Another study on rats shows that oleic acid, one of the main monounsaturated fats present in macadamia nuts, can protect the brain from certain kinds of oxidative stress.

5. They may prevent weight gain

Macadamia nuts and their oil are some of the richest sources of palmitoleic acid, a monounsaturated fat also called omega-7.

Researchers in one study gave sheep palmitoleic acid for 28 days, and the results show a reduction in weight gain by 77 percent. However, experts have not yet shown that palmitoleic acid has weight loss benefits in humans.

Another study shows that feeding mice macadamia nut oil as a supplement reduced the size of their fat cells after 12 weeks.

6. They stave off hunger

Macadamia nuts contain protein, high amounts of beneficial fats, and fiber. Together, these nutrients can help a person feel full for longer.

The fat takes longer to digest, and protein and fiber help prevent large blood sugar changes that can make a person feel hungry.

Side effects of eating macadamia nuts

Though macadamia nuts can be a part of a healthful diet, a person should try to remember the following possible drawbacks:

They are calorie-dense

Macadamia nuts are calorie-dense and can contain extra oil, salt, or sugar.

One cup, or 132 g, of macadamia nuts contains nearly 950 calories. This might be half of a person's daily calorie needs or more.

However, the standard serving size for macadamia nuts is 1 oz, or 28.4g, which is far less than 1 cup.

A 1-oz serving is about 10–12 nuts and contains around 200 calories. Using a food scale or counting the nuts and eating only the allotted amount can help prevent accidental overeating.

Eating macadamia nuts in place of other high-fat or high-calorie foods can provide their benefits without adding calories and fat to the diet. For instance, people can sprinkle a few macadamia nuts on a salad in place of bacon or croutons.

Another option is to eat a serving as a snack in place of chips, cookies, or other processed foods that offer little nutrition.

Roasting them may lower their nutrients

People can eat macadamia nuts raw or roasted. However, one study suggests that roasting macadamia nuts, especially at higher temperatures, can reduce their nutrient content. It may be best to consume raw or soaked macadamia nuts, or nuts roasted at a low temperature.

Some contain extra oil, salt, or sugar

Not all macadamia nuts are healthful choices. A person should look at the ingredients and choose types that contain only the nuts, and no sugar, salt, or added oil.

People with tree nut allergies must avoid them

Tree nut allergies are serious and can be life-threatening.

Even inhaling tiny particles of nuts can be enough to trigger an allergic reaction in some people. Those with nut allergies need to avoid macadamia nuts completely.

Those who live with a person who has nut allergies may also wish to steer clear of them. This is due to the risk of cross-contamination or accidentally exposing them to trace amounts of nuts.

Summary

People who are not allergic to macadamia nuts can enjoy them daily. Research has shown that they can help protect the brain, lower the risk of heart disease, and stave off hunger, among other things.

Some people use macadamia nut oil in cooking, as it is high in beneficial fats. It is also possible to use them in salads to replace higher-fat options such as croutons.

However, a person should remember that they contain a high number of calories.

Macadamia nuts are a whole food with plenty of good fats, vitamins, and minerals. They possess many health benefits that show promise. However, they are not a magic bullet for treating health conditions without making other complimentary lifestyle changes.

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